US3752030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw
Assignee: Individual
•
Filing: 1971-07-29
•
Granted: 1973-08-14
•
Expires: 1991-07-29
Abstract
Abstract A threaded fastener for securing sheet materials using self tapping techniques to cause continuous spreading, and compressing of the material surrounding the pilot hole so as to minimize stripping and increase holding power.
Inventors
- 👤 F Steurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:07
CPC Classifications
F; F16; F16B; F16B25/00; F16B25/0036; F16B25/0078; F16B25/001; F16B25/0021
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
87 words
A headed threaded fastener for securing sheet and thick materials, said fastener having a threaded lead-in section of uniform major diameter comprised of approximately two to two and one-half threads, a uniform thread having a gradual controlled taper extending from the lead-in section upwardly outwardly to the head, all of said threads extending continuously from the lead-in section to the head and being of uniform height and pitch, and said fastener having a uniform thread cross-section to increase root and total thread contour pressure while fastening material.
Claim 2
Dependent Claim
87 words
A headed threaded fastener for securing sheet and thick materials, said fastener having a threaded lead-in section of uniform major diameter comprised of approximately two to two and one-half threads, a uniform thread having a gradual controlled taper extending from the lead-in section upwardly outwardly to the head, all of said threads extending continuously from the lead-in section to the head and being of uniform height and pitch, and said fastener having a uniform thread cross-section to increase root and total thread contour pressure while fastening material.
Claim 3
Dependent Claim
27 words
The fastener recited in claim 1, in which a full thread is present at the head end of the fastener to insure final seating and holding power.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |